_____________________________________________________________________ Robert P. McGraw, Jr. Manager, Computer System EMAIL: [EMAIL PROTECTED] Purdue University ROOM: MATH-807 Department of Mathematics PHONE: (765) 494-6055 150 N. University Street FAX: (419) 821-0540 West Lafayette, IN 47907-2067
> -----Original Message----- > From: Paul Bijnens [mailto:[EMAIL PROTECTED] > Sent: Wednesday, August 02, 2006 11:37 AM > To: McGraw, Robert P. > Cc: amanda List > Subject: Re: tapetype question > > > On 2006-08-02 15:08, McGraw, Robert P. wrote: > > ./sbin/amtapetype -o -t LTO2HWC -e 200g -f /dev/rmt/1n > > > > Writing 2048 Mbyte compresseable data: 38 sec > > Writing 2048 Mbyte uncompresseable data: 76 sec > > WARNING: Tape drive has hardware compression enabled > > Estimated time to write 2 * 204800 Mbyte: 15200 sec = 4 h 13 min > > wrote 6422528 32Kb blocks in 98 files in 7358 seconds (short write) > > wrote 6455296 32Kb blocks in 197 files in 7737 seconds (short write) > > define tapetype LTO2HWC { > > comment "just produced by tapetype prog (hardware compression on)" > > length 201216 mbytes > > filemark 0 kbytes > > speed 27315 kps > > } > > > > I am in the process of trying to find out how to turn off hardware > > compressing for the Solaris 10 OS. > > > I hope you did understand that turning off hardware compression for > LTO tape drives is not so important as for most other tape drives. [McGraw, Robert P.] Yes I did. > > So why doing the effort, while you can use both hard- and software > compression, and not suffer from the bad side effect (expanding data > and loosing capacity) that most other tape drives have. [McGraw, Robert P.] Inquiring minds want to know. I have a request in to Sun support to try and find the answer. > > As Joshua, I have hardware compression turned ON for my LTO2 drive, > so that a few DLE's on slow hosts, where I cannot afford software > compression, still benefit from the hardware compression and my > tapes can hold more than 100% data now and then. [McGraw, Robert P.] I am planning to leave it as is. I do not software compress at this time. Why take up the CPU cycles to software compress your data if it is going to be compressed on hardware? Thanks Robert > > > -- > Paul Bijnens, xplanation Technology Services Tel +32 16 397.511 > Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512 > http://www.xplanation.com/ email: [EMAIL PROTECTED] > *********************************************************************** > * I think I've got the hang of it now: exit, ^D, ^C, ^\, ^Z, ^Q, ^^, * > * F6, quit, ZZ, :q, :q!, M-Z, ^X^C, logoff, logout, close, bye, /bye, * > * stop, end, F3, ~., ^]c, +++ ATH, disconnect, halt, abort, hangup, * > * PF4, F20, ^X^X, :D::D, KJOB, F14-f-e, F8-e, kill -1 $$, shutdown, * > * init 0, kill -9 1, Alt-F4, Ctrl-Alt-Del, AltGr-NumLock, Stop-A, ... * > * ... "Are you sure?" ... YES ... Phew ... I'm out * > ***********************************************************************
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